# A107507 (b-file synthesized from sequence entry)
0 1
1 264
2 13488
3 278168
4 3237984
5 25290408
6 147204624
7 684347448
8 2666539200
9 9015945800
10 27141718896
11 74182306776
12 186879023392
13 439124493288
14 971672262864
15 2040402823544
16 4092008534400
17 7879085829000
18 14630516376112
19 26297796632856
20 45903762942432